public void Test()
{
SingleColumnCollection c = new SingleColumnCollection();
Assert.AreEqual <string>("china", c[0]);
Assert.AreEqual <int>(2, c["ch"].Length); // 命中china和chile两项
Assert.AreEqual <string>("china", c["ch"][0]);
}
public void IndexerTest()
{
SingleColumnCollection collection = new SingleColumnCollection(new [] { "China", "Chile", "UK" });
Assert.AreEqual("China", collection[0]);
string[] candidates = collection["Ch"];
Assert.AreEqual(2, candidates.Length);
Assert.AreEqual("China", candidates[0]);
Assert.AreEqual("Chile", candidates[1]);
}